我有一个类，它应该充当具有属性的对象的集合。当这些属性被访问时，我可以调用一个函数吗？

class ObjectCollection:
    def __init__(self):
        self._objects = []

    def add_object(self, obj):
        self._objects.append(obj)

    def get_objects(self):
        return self._objects

    @property
    def count(self):
        return len(self._objects)

    @count.setter
    def count(self, value):
        if value >= 0:
            self._objects = self._objects[:value]
        else:
            raise ValueError("Count cannot be negative.")

# 示例用法
collection = ObjectCollection()
collection.add_object("Object 1")
collection.add_object("Object 2")
collection.add_object("Object 3")

print(collection.get_objects())  # 输出: ['Object 1', 'Object 2', 'Object 3']
print(collection.count)  # 输出: 3

collection.count = 2  # 设置count属性为2，调用count.setter方法
print(collection.get_objects())  # 输出: ['Object 1', 'Object 2']

collection.count = -1  # 设置count属性为-1，调用count.setter方法，抛出ValueError异常